dull [ˈdʌl]

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¹ dull adjective

• not exciting or interesting : boring
• having an edge or point that is not sharp
• not clear and loud

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² dull verb

• to become dull or to make (something) dull: such as
• to become or cause (something) to become less clear, distinct, bright, or shiny
• to make (something, such as a feeling) less sharp, strong, or severe